Anvil



FIG. 1 is a front view of the anvil;

FIG. 2 is a back view of the anvil;

FIG. 3 is a left view of the anvil;

FIG. 4 is a right view of the anvil;

FIG. 5 is a top view of the anvil; and,

FIG. 6 is a bottom view of the anvil. 

The ornamental design for an anvil, as shown and described. 